Terry Hutchinson concedes that the damage to the Artemis AC72 catamaran caused by "user error"

Terry Hutchinson has mentioned that the reason that their AC72 catamaran suffered beam damage came down to a mistake in towing method rather than a fault in the new boats design. 

http://www.sail-world.com/Australia/Americas-Cup:-Mental-mistake-leads-to-delay-for-Artemis-racing/103295